package com.cll.netty.netty.heartbeat;

import java.util.concurrent.TimeUnit;

import com.cll.netty.netty.websocket.MyTextWebSocketFrameHandler;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.timeout.IdleStateHandler;

/**
 * 心跳
 */
public class MyServer {
    public static void main(String[] args) throws Exception{
        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        ServerBootstrap bootstrap = new ServerBootstrap();
        try {
            bootstrap.group(bossGroup,workerGroup)
                    .channel(NioServerSocketChannel.class)
                    // 日志
                    .handler(new LoggingHandler(LogLevel.INFO))
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            ChannelPipeline pipeline = socketChannel.pipeline();
                            /**
                             * 加入一个netty提供IdleStateHandler
                             * 说明
                             * 1. IdleStateHandler 是netty提供的处理空闲状态的处理器
                             * 2. readerIdleTime： 表示多长时间没有读，就会发送一个心跳检测包检测是否连接
                             * 3. writerIdleTime： 表示多长时间没有写，就会发送一个心跳检测包检测是否连接
                             * 4. allIdleTime： 表示多长时间没有读写，就会发送一个心跳检测包检测是否连接
                             * 5. TimeUnit： 时间单位
                             * 6. 文档说明
                             *      triggers an {@link IdleStateEvent} when a {@link Channel} has not performed
                             *      read,write,or both operation for a while,
                             * 7. 当IdleStateHandler触发后，就会传递给管道的下一个handler去处理
                             *      通过调用（触发）下一个handler的userEventTiggered, 在该方法中去处理
                             *      IdleStateEvent(读空闲，写空闲，读写空闲)
                             */
                            pipeline.addLast(new IdleStateHandler(3,5,7, TimeUnit.SECONDS));
                            // 加入一个对空闲检测进一步处理handler(自定义)
                            pipeline.addLast(new MyTextWebSocketFrameHandler());
                        }
                    });
            ChannelFuture channelFuture = bootstrap.bind(5668).sync();
            channelFuture.channel().closeFuture().sync();
        }finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}
